Re: [lisp] Éric Vyncke's No Objection on draft-ietf-lisp-gpe-16: (with COMMENT)

"Fabio Maino (fmaino)" <fmaino@cisco.com> Tue, 07 July 2020 23:42 UTC

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From: "Fabio Maino (fmaino)" <fmaino@cisco.com>
To: "Eric Vyncke (evyncke)" <evyncke@cisco.com>, The IESG <iesg@ietf.org>
CC: "lisp-chairs@ietf.org" <lisp-chairs@ietf.org>, "draft-ietf-lisp-gpe@ietf.org" <draft-ietf-lisp-gpe@ietf.org>, "lisp@ietf.org" <lisp@ietf.org>
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Subject: Re: [lisp] =?utf-8?q?=C3=89ric_Vyncke=27s_No_Objection_on_draft-ietf?= =?utf-8?q?-lisp-gpe-16=3A_=28with_COMMENT=29?=
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Thanks for your review Eric. Please see below our replies. 

On 7/7/20, 1:02 AM, "lisp on behalf of Éric Vyncke via Datatracker" <lisp-bounces@ietf.org on behalf of noreply@ietf.org> wrote:

    Éric Vyncke has entered the following ballot position for
    draft-ietf-lisp-gpe-16: No Objection

    When responding, please keep the subject line intact and reply to all
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    Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
    for more information about IESG DISCUSS and COMMENT positions.


    The document, along with other ballot positions, can be found here:
    https://datatracker.ietf.org/doc/draft-ietf-lisp-gpe/



    ----------------------------------------------------------------------
    COMMENT:
    ----------------------------------------------------------------------

    Thank you for the work put into this document. This is really useful work and
    the document is easy to read.

    Please find below a couple of non-blocking COMMENTs (and I would appreciate a
    reply to each of my COMMENTs).

    I hope that this helps to improve the document,

    Regards,

    -éric

    == COMMENTS ==
    As this document is in the same 'batch'/timing as the RFC 6830 bis, is there a
    reason why this extension is not in the bis document itself?

[FM] there were quite a few changes and discussions introduced in 6830bis. The WG thought that keeping lisp-gpe as a separate document would simplify the review process. 

    -- Section 3 --
    What is the reason why not reusing an existing 'next protocol' registry? Or
    using a 16-bit Ethernet type like field (as in GRE) ?

[FM] the LISP header uses the last 3 octets in the first 32-bit word for the nonce/versioning features. We designed a reduced NP field to try to squeeze a limited version of those features using octets 2-3 of lisp-gpe. It turned out that the limitations imposed by the shorter field where too much, and eventually the WG decided to eliminate the nonce/versioning features altogether from lisp-gpe. Reversing now back to 16-bit NP field, would impact the early lisp-gpe implementations that have been built so far. 

    As a side cosmetic note, I would have preferred to have 0x04 for IPv4 and 0x06
    for IPv6.

[FM] we decided to assign them incrementally. We really didn’t have enough meaningful payloads to get up to 6... 


    "the shim header MUST come before the further protocol" but, if there are other
    headers defined in LISP (I must confess my ignorance on this), should the shim
    header be just after the LISP header ? I.e. the first one of a potential chain
    (cfr IPv6 extension header chains) ?

    It is unclear whether a shim header 'next protocol' field can also have a value
    associated to yet another shim header.

[FM] Good catch. We have re-phrased the text to make clear that there might be multiple shim headers, and they should be in front of the actual payload identified by NP 0x01-0x7F. 
This is ithe new text:  " When shim headers are used with other protocols identified by next protocol values from 0x0 to 0x7D, all the shim headers MUST come first."

    == NITS ==
    The document title "LISP Generic Protocol Extension" is generic while the
    document is mainly about "multi-protocol encapsulation". Should the title be
    changed? As a non-English speaker, I read the title as how to make any/generic
    extension to the LISP protocol and not as a LISP extension to support the
    transport of generic/any protocol.

[FM] one can use lisp-gpe to extend the LISP encapsulation protocol to support generic payloads (IPv6, ethernet, NSH, iOAM, GBP, ...) in addition to IP. However it is also possible to use lisp-gpe to extend LISP features. For example, one could use a shim header to implement a nonce/versioning field of arbitrary size. That's the reason we think of the draft as a LISP Generic Protocol Extension.  

    -- Section 3 --

[FM] all the suggestions below are addressed in rev-17

    Strongly suggest to make it clear by adding a MUST in  "and ignored on
    receipt", i.e., "and MUST be ignored on receipt"

    "0x05 to 0x7D " the final ':' is missing.

    Why not writing " 0x7E, 0x7F:" ?

    "deploy new GPE features", GPE is not expanded before this first use (even if
    quite obvious in this document).

    s/octect/octet/

Thanks,
Fabio

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